Originally Posted by beninan
Is it true that a refractometer can only be used with non-fermented wort as the alcohol will throw the readings off?
I've wanted to get one myself but can seem to stomach the cost of one for only checking the OG, and still having to use a hydrometer to check the FG. Maybe I'm missing something important here...
There's are conversion tables for using them post (or during) fermentation....
Morebeer.com has one somewhere on their website.
They are helpful for all-grain brewers who want to check their gravities multiple times during the process.
IMO they don't replace a hydrometer, they augment them.